US20220146679A1 - Laser scanning device and method for the three-dimensional measurement of a setting from a great distance - Google Patents

Laser scanning device and method for the three-dimensional measurement of a setting from a great distance Download PDF

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Publication number
US20220146679A1
US20220146679A1 US17/438,283 US202017438283A US2022146679A1 US 20220146679 A1 US20220146679 A1 US 20220146679A1 US 202017438283 A US202017438283 A US 202017438283A US 2022146679 A1 US2022146679 A1 US 2022146679A1
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Prior art keywords
receiver
divergence
laser
unit
scanning
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English (en)
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Frank Schneider
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Jenoptik Optical Systems GmbH
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Jenoptik Optical Systems GmbH
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/483—Details of pulse systems
    • G01S7/486—Receivers
    • G01S7/4861—Circuits for detection, sampling, integration or read-out
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/22—Measuring arrangements characterised by the use of optical techniques for measuring depth
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/42—Simultaneous measurement of distance and other co-ordinates
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G01S17/93—Lidar systems specially adapted for specific applications for anti-collision purposes
    • G01S17/931—Lidar systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
    • G01S7/4812—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver transmitted and received beams following a coaxial path
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4817—Constructional features, e.g. arrangements of optical elements relating to scanning
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/483—Details of pulse systems
    • G01S7/484—Transmitters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/483—Details of pulse systems
    • G01S7/486—Receivers
    • G01S7/487—Extracting wanted echo signals, e.g. pulse detection
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/483—Details of pulse systems
    • G01S7/486—Receivers
    • G01S7/487—Extracting wanted echo signals, e.g. pulse detection
    • G01S7/4876—Extracting wanted echo signals, e.g. pulse detection by removing unwanted signals

Definitions

  • the invention relates to a laser scanning device and a related method.
  • 3D cameras are increasingly being replaced by laser scanning devices, which are required to a greater or lesser extent, depending on the intended use, to have a large field of view, a high spatial resolution, a long range and/or a large dynamic range. These requirements are fundamentally contradictory to each other. It is also imperative that the parameters of the laser pulses emitted by the laser scanning device are selected so that their energy is within the eye safety range.
  • Known laser scanning devices such as those disclosed in the aforementioned EP 2,182,377 B1, and thus also a laser scanning device according to the invention, comprise a transmitter unit for transmitting laser pulses, a receiver unit for receiving a respective portion of a laser pulse reflected at a target object, a memory and evaluation unit for determining distances from receiver signals formed by the receiver unit, and a movable deflection unit for one- or two-dimensional deflection of the radiation direction of the laser pulses in the surveillance area.
  • individual laser pulses are emitted one after the other with a frequency that is limited upwards by the maximum expected travel time of a laser pulse.
  • the travel time of a laser pulse corresponds to the time between the transmission of the laser pulse and its time of reception.
  • the time of reception is determined by the occurrence of a certain characteristic, for example a maximum, of a useful signal component in the receiver signal caused by the received reflected portion of the laser pulse. Knowing the respective position of the deflection unit and the spatial orientation of the transmitter and receiver units at a point in time of the emission of a laser pulse and the corresponding determined distance, a three-dimensional depth profile can be created over the surveillance area.
  • the position of the deflection unit is usually determined, for a line scanner, by a horizontal angle in a scanning plane around an axis of rotation or, for a matrix scanner, by a horizontal angle in a scanning plane around an axis of rotation and a vertical angle in a cross-scan plane around a second axis of rotation in a coordinate system.
  • the laser pulse frequency selected, the spatial resolution decreases with increasing scanning speed and increasing distance of the expected target objects in the setting.
  • the reception divergence or the size of the receiver surface of the receiver unit in the scanning direction must be selected in such a way that a portion of the laser pulse reflected at the target object is detected by the receiver unit, although the receiver unit is moved at the scanning speed relative to the target object.
  • a receiver signal is understood to be an amplitude signal that is formed over the reception time of the receiver unit by the useful signal component and a noise signal component caused (among other things) by the constant light.
  • Detecting the useful signal component or a characteristic of the useful signal component in a single receiver signal requires at least that the amplitude caused by the useful signal component in the receiver signal is higher than the highest amplitude caused by the noise signal component, which is not the case for very large distances.
  • Typical measures to reduce the influence of constant light include placing a narrow-band optical filter in front of the receiver surface of the receiver unit, which filter has a maximum transmission in the spectral range of the emitted laser pulse, and selecting the receiver unit with an adapted spectral sensitivity as well as adapting the spectral bandwidth of the amplifier to the spectrum of the laser pulse. For greater distances, from which a reflected useful signal component only has a comparatively small amplitude, which can already be the case at a distance of approx. 50 m, these measures are often not sufficient.
  • DE 10 2011 054 451 A1 discloses a method and a device for optical distance measurement over large distance ranges, in which second laser pulses suitable for evaluation according to the sampling method are emitted if no reception times can be derived when evaluating the receiver signals according to the threshold method caused by a first laser pulse.
  • second laser pulses suitable for evaluation according to the sampling method are emitted if no reception times can be derived when evaluating the receiver signals according to the threshold method caused by a first laser pulse.
  • the time of reception can be determined from the receiver signals using the threshold method, which provides more accurate results.
  • the time of reception can be determined from small amplitudes of the useful signal components, for which an evaluation via the threshold method does not work, via the sampling method from the receiver signals by means of an accumulation of sampled receiver signals.
  • a large distance range requires a large dynamic range, and there is no stringent need to also take measures to suppress constant light if the amplitude of the useful signal component is sufficiently high.
  • a distance meter with a long range if the expected target objects are all within a great measuring distance, only a small dynamic range may be sufficient, but it may then be necessary to take measures to minimise the influence of constant light on the receiver signal or to improve the evaluability of the receiver signal.
  • receiver signals via the sampling method and the improvement of their evaluability by accumulation of receiver signals are described in the aforementioned DE 10 2011 054 451 A1.
  • the analog receiver signal is sampled and digitised samples are formed, each of them being assigned to one of the sampling times and, in their entirety, forming a digitised sampled signal.
  • an accumulated receiver signal is formed.
  • the accumulated receiver signal has a better signal-to-noise ratio SNR than the individual receiver signals and thus allows the range to be increased.
  • the improvement of the SNR is proportional to the square root of the number of individual receiver signals forming the accumulated receiver signal.
  • Typical areas of application for such laser scanning devices are surveillance technology in industry and in vehicles, where objects can be located within the monitored area at distances ranging from a few centimeters to several tens of meters. Accordingly, the dynamic range within which a receiver signal on the one hand does not lead to overmodulation, but on the other hand can still be formed, has to be very large. The requirement for a large dynamic range also applies if the target objects have different surfaces and thus very different remission behavior.
  • Several individual solutions disclosed in the prior art which have a large dynamic range, also lead to an improvement of the signal-to-noise ratio between the actual useful signal component, caused by the portion of a laser pulse reflected at the target object, and a noise signal component superimposed on this useful signal component.
  • U.S. Pat. No. 5,311,353 A discloses a wide dynamic range optical receiver in which a first linear amplifier and a second logarithmic amplifier are provided.
  • the two amplifier signals formed are either added together or one of the two amplifier signals is selected for evaluation.
  • weak receiver signals lie within the dynamic range of the first amplifier and are amplified linearly
  • strong receiver signals lie within the dynamic range of the second amplifier and are amplified logarithmically.
  • Both individual dynamic ranges of the amplifiers together represent the effective dynamic range of the receiver. Constant light is not mentioned as a problem here, which may be due to the fact that even at the largest expected target distances, the receiver signal is still expected to have a useful signal component that is significantly higher than the noise signal components.
  • the aforementioned EP 2,182,377 B1 also proposes a distance meter, in this case a distance-measuring laser scanner, with the aforementioned features of known laser scanning devices, wherein the effective dynamic range, which is too large for a single amplifier element, is divided by using two amplifiers.
  • the receiver signal is fed in parallel to a more sensitive and to a less sensitive amplification path, which are connected to a first and a second amplifier, respectively.
  • the two amplification paths are routed to a common analog-to-digital converter for cost reasons, reversibly combining the two receiver signals of the amplification paths beforehand.
  • this solution is intended to have the advantage that the separate evaluation of weak and strong receiver signals allows the suppression of weak interfering signals, for example from a windshield or fog droplets, which falsify the measurement result due to an overlap with the actual useful signal.
  • EP 2,998,700 B1 addresses the actual problem that arises with regard to the quality of the receiver signals and their evaluation for scanning laser distance meters in contrast to laser distance meters with a stationary transmitter. Said problem results from a high scanning speed, which means that the receiver must be designed with a large field of view (FOV) so that the received beam reflected back from the target object impinges on the receiver or its receiver surface.
  • FOV field of view
  • receivers with a large field of view have the disadvantage that, accordingly, a large amount of daylight or ambient light (constant light) also impinges on the receiver.
  • an increasingly larger field of view leads to an increasingly lower spatial resolution of the depth profile formed by the setting in the field of view of the laser scanning device.
  • a distance measuring method and an optoelectronic distance meter suitable for scanning systems are proposed with a detector that is said to be improved not only in terms of dynamic range but also in terms of signal-to-noise ratio.
  • the detector has two independent receiving segments, each of which is provided for generating a resulting electrical receiver signal independently of the other and is designed to be assigned to predefined different distance ranges.
  • the required effective dynamic range of the distance meter is divided into smaller dynamic ranges. By dividing the detector into independent receiving segments, the amount of background light is intended to be divided as well, which should reduce its influence on a formed receiver signal.
  • a scene to be detected is detected in partial areas by scanning the scene horizontally.
  • a receiver matrix whose pixels have a reduced reception divergence, at least in the scanning direction, is used to detect the partial areas.
  • the reduced divergence is intended to increase the signal-to-noise ratio between the useful signal to be detected and the background light.
  • the lower divergence further leads to better spatial resolution, which also reduces the influence of artifacts caused by glare from very bright light sources. How the low divergence affects the dynamic range of the distance measurement is not disclosed therein, especially since no measures are provided to improve the signal quality of weak useful signals from long distances.
  • the method is intended to improve the spatial resolution of a depth profile (distance image) of the setting generated from the receiver signals.
  • FIG. 1 shows a schematic diagram of an exemplary embodiment of a laser scanning device according to the invention
  • FIG. 2 shows a view of an exemplary arrangement of two receiver units and four transmitter units, each having two transmission channels, and
  • FIG. 3 shows a simplified schematic view of the process sequence.
  • FIG. 1 shows an exemplary embodiment of a laser scanning device according to the invention for the three-dimensional measurement of a setting in a field of view FOV at a great distance.
  • a great distance is understood to be a distance from which a reflected and detected portion LP′ of a laser pulse LP causes a useful signal component SN in a receiver signal S that does not stand out from a noise signal component SR caused by constant light. Depending on the reflectivity of the setting, this can already be the case at a distance of approx. 50 m.
  • the laser scanning device comprises at least one transmitter unit 1 , having at least one transmission channel 1 . 1 , for transmitting laser pulses LP in a sequence and at least one receiver unit 2 , having a receiver channel 2 . 1 , which has a receiver surface 2 . 1 . 1 , for receiving portions LP′ of the laser pulses LP reflected back from measurement fields M of the setting in a sequence and for forming receiver signals S.
  • the optionally several transmission channels 1 . 1 are arranged next to each other in a cross-scan direction R C .
  • the laser scanning device shown as a schematic diagram in FIG. 1 has two transmitter units 1 , each with a transmission channel 1 . 1 , and a receiver unit 2 as an example.
  • a laser scanning device like the prior art laser scanning devices of the same generic type, generally also has an analog-to-digital converter 3 for digitizing the receiver signals S, a deflection unit 4 for scanning the laser pulses LP in a scanning direction R S , a memory and evaluation unit 5 , and a control unit 6 .
  • the transmission channels 1 . 1 are designed so that the emitted laser pulses LP have a rectangular beam cross-section, and that the receiver surface 2 . 1 . 1 is rectangular. Furthermore, it is essential to the invention that an emission divergence of the transmission channels 1 . 1 and a reception divergence of the receiver channels 2 . 1 in the scanning direction R S are each multiple times greater than an emission divergence of the transmission channels 1 . 1 and a reception divergence of the receiver channels 2 . 1 in the cross-scan direction R C perpendicular to the scanning direction R S . As a result, a measurement field M in the field of view FOV, which is impinged by one of the laser pulses LP in each case, obtains a rectangular shape with a larger extension in the scanning direction R S .
  • the memory and evaluation unit 5 contains a plurality of memory and evaluation areas 5 . 1 for parallel storage of digitized receiver signals SD and for formation of several accumulated receiver signals SA, from each of which a distance can be derived via algorithms known to the person skilled in the art.
  • the emission and reception divergences in the scanning direction R S are at least three times the emission and reception divergences in the cross-scan direction R C in order to achieve a high overlap of the measurement fields M even at a high scanning speed.
  • the measurement field M is advantageously not restricted by the smaller divergence in either direction.
  • the added emission divergence of all transmission channels 1 . 1 in the cross-scan direction R C is determinative for the size of the field of view FOV in the cross-scan direction R C , while the emission divergence in the scanning direction R S and the scan angle by which the deflection unit 4 can be deflected about a rotation axis are determinative for the size of the view angle of the field of view FOV in the scanning direction R S .
  • the size of the respective measurement fields M impinged by a laser pulse LP depends on the emission and reception divergences of the transmission and receiver channels 1 . 1 , 2 . 1 and the distance of the setting in the angular range thus limited. All measurement fields M together form the field of view FOV.
  • the number of transmission channels 1 . 1 determines the number of measurement fields M lying one above the other in the cross-scan direction R C .
  • there are two transmitter units 1 each with a transmission channel 1 . 1 , whose emission divergences are matched to the reception divergences of the receiver channel 2 . 1 of the one receiver unit 2 .
  • the transmitter units 1 are controlled continuously in alternation, so that during a scan (one-time scanning of the field of view FOV), the field of view FOV is scanned quasi simultaneously in two lines. Since the two transmitter units 1 are controlled one after the other, they can both be assigned to the only one receiver channel 2 . 1 , with the reception divergence of the one receiver channel 2 . 1 in the cross-scan direction R C being equal to or greater than a resulting emission divergence of the two transmission channels 1 . 1 in the cross-scan direction R C .
  • receiver units 2 There may also be two or more receiver units 2 , which are arranged next to each other in the cross-scan direction R C and to each of which one or more transmission channels 1 . 1 are assigned, and if there are several transmission channels 1 . 1 , these belong to different transmitter units 1 .
  • FIG. 2 shows an example of an arrangement of two receiver units 2 , represented by the receiver surfaces 2 . 1 . 1 , and four transmitter units 1 , each with two transmission channels 1 . 1 , represented by eight measuring surfaces M projected onto the receiver surfaces 2 . 1 . 1 .
  • one transmission channel 1 . 1 from each of the four transmitter units 1 is assigned to one of the receiver surfaces 2 . 1 . 1 , so that the measuring surfaces M projected onto one receiver surface in each case are illuminated by the four transmitter units 1 .
  • a field of view FOV resolved into eight lines can be scanned quasi-simultaneously during a scan.
  • the transmitter units 1 are controlled consecutively in this case.
  • the laser pulse LP emitted in each case is directed via two transmission channels 1 . 1 into the field of view FOV, where different measurement fields M are impinged and the reflected portions LP′ of the laser pulse LP are received in each case by one of the two receiver units 2 .
  • the spatial resolution of the field of view FOV in the cross-scan direction R C is determined by the emission and reception divergence in the cross-scan direction R C .
  • the spatial resolution is determined by the signal processing of the receiver signals S according to the invention, largely independently of the scanning speed and pulse frequency at which the laser pulses LP are emitted and scan the field of view FOV.
  • Signal processing is a process step of the method according to the invention described below.
  • the field of view FOV is divided into virtual receiver cells VE forming a row or a matrix, each of said virtual receiver cells VE being characterized by a virtual divergence angle about an imaginary center axis, which is multiple times smaller than the emission and reception divergence in the scanning direction R S , so that several virtual receiver cells VE are located simultaneously within one of the measurement fields M.
  • the spatial positions of the center axes of the virtual receiver cells VE are each characterized by an angle as in the scanning direction R S and an angle ⁇ C in the cross-scan direction R C , as shown by the example of a virtual receiver cell VE( ⁇ C , ⁇ S ) in FIG. 1 .
  • the digitized receiver signals SD are respectively assigned to each of the virtual receiver cells VE located within one of the measurement fields M, and the scanning speed and the pulse frequency are matched to each other such that the measurement fields M overlap in the scanning direction R S , so that each virtual receiver cell VE is assigned a plurality of successive digitized receiver signals SD, from which an accumulated receiver signal SA with an accumulated useful signal component SAN, from which a distance is derived, is formed for each of the virtual receiver cells VE.
  • Virtual receiver cells VE only partially located in the measurement field M are either considered to be located in the measurement field M or to be located outside the measurement field M.
  • the memory and evaluation unit 5 of a laser scanning device used to carry out the method can contain several memory and evaluation areas 5 . 1 for this purpose. Their number is at least equal to the number of virtual receiver cells VE respectively located in a measurement field M.
  • Each memory and evaluation area 5 . 1 is then assigned to one of the virtual receiver cells VE.
  • the digitized receiver signals SD are each stored in parallel in those memory and evaluation areas 5 . 1 which are assigned to virtual receiver cells VE that lie within the measurement field M belonging to the digitized receiver signal SD.
  • Accumulated receiver signals SA are formed from the digitized receiver signals VE stored in each case by a memory and evaluation unit 5 , from which accumulated receiver signals SA a distance assigned to one of the virtual receiver cells VE is derived in each case.
  • FIG. 3 shows the field of view FOV, which is divided here into a row of virtual receiver cells VE, at four successive times T M1 -T M4 , at each of which the position of the measurement field M has changed significantly.
  • the scanning speed is only such that, preferably, more than 20 digitized receiver signals SD are accumulated per virtual receiver cell VE.
  • the receiver signals S (M1) -S (M4) obtained in each case from the reflected portion LP′ of each laser pulse LP are converted into digitized receiver signals SD (M1) to SD (M4) and accumulated with further digitized receiver signals SD (M1) -SD (M4) to form in each case an accumulated receiver signal SA (VE2) -SA (VE4) assigned to one of the virtual receiver cells VE 2 -VE 4 .
  • the signal curves shown in FIG. 3 are only symbolic. Likewise, the number of virtual receiver cells VE covered per measurement field M and the offset of measurement fields M successively generated in the scanning direction R S only serve as examples.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Electromagnetism (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
US17/438,283 2019-03-13 2020-03-10 Laser scanning device and method for the three-dimensional measurement of a setting from a great distance Pending US20220146679A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102019106411.2 2019-03-13
DE102019106411.2A DE102019106411B4 (de) 2019-03-13 2019-03-13 Laserscaneinrichtung und Verfahren zur dreidimensionalen Vermessung einer Szenerie in großer Entfernung
PCT/DE2020/100164 WO2020182255A1 (de) 2019-03-13 2020-03-10 LASERSCANEINRICHTUNG UND VERFAHREN ZUR DREIDIMENSIONALEN VERMESSUNG EINER SZENERIE IN GROßER ENTFERNUNG

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EP (1) EP3938804A1 (de)
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EP2998700B2 (de) 2014-09-18 2022-12-21 Hexagon Technology Center GmbH Elektrooptischer Distanzmesser und Distanzmessverfahren
US11009592B2 (en) * 2016-06-06 2021-05-18 Argo AI, LLC LiDAR system and method
US11002853B2 (en) * 2017-03-29 2021-05-11 Luminar, Llc Ultrasonic vibrations on a window in a lidar system

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EP3938804A1 (de) 2022-01-19
DE102019106411B4 (de) 2021-06-10

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